矿间孤岛煤柱开采工作面防冲优化布置

Optimal Layout for Rockburst Prevention of Isolated-island Mining Face with Coal Pillars between Mines

针对华亭煤矿2501采区上分层工作面剩余392 m,只能够布置2个工作面,最后1个工作面将成为孤岛工作面,冲击危险性较高的现状,分别从负煤柱留设及小煤柱留设2个角度对工作面进行了优化设计。因负煤柱留设丢失资源过多,对方案进行了否定。对小煤柱留设分别按照工作面等长、前短后长、前长后短3个方案进行了数值模拟,最终确定当250108-1工作面长度为166 m,250109-1工作面为226 m时,在满足采掘接续等条件的情况下可使未采煤体、顺槽内及边界煤柱处集中应力降至最低,为后期孤岛工作面开采创造条件。

There is 392 m left in the upper stratified working face in 2501 mining area of Huating Coal Mine,where only two working faces can be arranged,and the last one will become an isolated-island working face with high impact risk.In view of the situation,the optimal design of working face was carried out from the two angles of negative coal pillar setting and small coal pillar setting.The scheme of negative coal pillar setting was negated because of the excessive loss of resources.The numerical simulation of small coal pillar setting was carried out according to the three schemes of equal length of working face,short front and long back,and long front and short back respectively.Finally,it was determined that when the length of working face 250108-1 was 166 m,and that the working face 250109-1 was 226 m,the concentrated stress in the unmined coal body,along the channel and the coal pillar at the border can be reduced to the minimum under the conditions of mining connection,which can create conditions for later mining of isolated-island working face.